摘要
在群体水培条件下,以国内、外不同年代育成的常规籼稻代表品种（2001年为88个、2002年为122个）为材料,测定干物重（包括根系）、根系性状和根系活性、产量及其构成因素等,采用组内最小平方和的动态聚类方法将供试品种按单穗重从低到高依次分为A、B、C、D、E、F6类,研究各类品种根系的基本特点。结果表明,供试品种间单穗重的差异很大（两年分别相差493%和764%）,A、B、C、D、E、F类品种的平均单穗重,2001年分别为0.99、1.56、2.00、2.54、3.16、4.08g,2002年分别为0.82、1.38、1.80、2.38、3.04、4.29g。大穗型品种每株不定根总长、每株根干重、每株根系总吸收面积显著大于小穗型品种。大穗型品种每穗根数、每穗根重、每穗根长、每穗根系总吸收面积、每穗根系活跃吸收面积、每穗根系活性显著优于小穗型品种。多元回归分析表明,显著影响单穗重的主要根系性状是每穗根长、每穗根重、抽穗期冠根比、每穗根系总活力,决定系数为0.620~0.639。随着每穗根长、每穗根重、抽穗期冠根比、每穗根系总活力提高单穗重显著增加。
Eighty-eight and one hundred and twenty two conventional indica rice cultivars were solution-cultured in 2001 and 2002, respectively. Dry matter weight （including root system, culm and sheath, leaves, panicle）, root traits, root physiological activity, yield and its components were measured. The tested rice cultivars were classified into six types （i.e. A, B, C, D, E, and F, A was the lowest, and F was the highest） based on their panicle weight level by the MinSSw method, to study their differences of root traits, root physiological activity. Difference of panicle weight of the cultivars used in this study was very large （the ratio of the maximal panicle weight to the minimum panicle weight in 2001 and 2002 were 493% and 764%, respectively）, the average of panicle weight was 0.99, 1.56, 2.00, 2.54, 3.16, and 4.08 grams per panicle in 2001, and 0.82, 1.38, 1.80, 2.38, 3.04, and 4.29 grams per panicle in 2002, respectively. Root dry weight per plant, total length of adventitious roots per plant, and total root ab- sorption area per plant in large-panicle type cultivars higher than those in small-panicle type cultivars. Number of adventitious roots per panicle, root dry weight per panicle, length of adventitious roots per panicle, total root absorption area per panicle, root active absorption area per panicle, and root activity per panicle in large-panicle type cultivars were higher than those in small-panicle type cultivars. Polynomial regression analysis showed that panicle weight was significantly influenced by length of adventitious roots per panicle, root dry weight per panicle, ratio of shoot to root at heading stage, root activity per panicle, and the determinant coefficient ranged from 0.620 to 0.639. Larger panicle weight could be reached by increasing length of adventitious roots per panicle, root dry weight per panicle, ratio of shoot to root at heading stage, root activity per panicle.
出处
《作物学报》
CAS
CSCD
北大核心
2009年第7期1357-1363,共7页
Acta Agronomica Sinica
基金
国家自然科学基金项目(30270777和30771275)资助
关键词
籼稻
品种
穗重
根系性状
根系活性
Conventional indica rice
Cultivars
Panicle weight
Root traits
Root physiological activity
